Cascade power amplifier piezoelectric ceramic drive power supply

Abstract

The present invention discloses a cascaded power amplification piezoelectric ceramic driving power supply, including a voltage-stabilized power supply module, a control signal generating module, a linear amplifying circuit module, a power amplifying module and a load module; the input end of the control signal generating module is connected to the input signal, the output end of the control signal generating module is connected to the in-phase input end of the linear amplifying circuit module, the output voltage of the linear amplifying circuit module is amplified by the power amplifying module, the output voltage drives the load module, and the output end of the load module is connected to the ground; the voltage-stabilized power supply module includes a positive and negative low-voltage DC power supply and a positive and negative high-voltage DC power supply; the linear amplifying circuit module includes a first-stage operational amplifier and a second-stage operational amplifier; phase compensation and isolation resistors and feedback capacitors are added to the second-stage operational amplifier for stability compensation. The present invention is a driving power supply with high efficiency, simple structure, high power and low ripple.

Description

Technical Field

[0001] The invention relates to a driving power supply, in particular to a cascaded power amplifying piezoelectric ceramic driving power supply. Background Art

[0002] With the rapid development of precision engineering and micro-engineering, submicron and nano-level positioning technology and micro-servo technology have become key technologies in frontier disciplines such as micro-electromechanical systems, ultra-precision machining, microelectronics, optoelectronics and bioengineering. Piezoelectric ceramics (PZT) have the advantages of high resolution, small size, large output force, high frequency response, no heat and fast response speed. It is the preferred driving element for micro-displacement actuators. The positioning accuracy and frequency response characteristics of piezoelectric ceramics are directly related to their driving power supply, and the capacitance characteristics of piezoelectric ceramics have an adverse effect on the stability and dynamic characteristics of the driving power supply. In actual use, the equivalent capacitance of piezoelectric ceramics fluctuates greatly with environmental influences and input voltage changes, affecting the stability of the driving power supply. At present, 6-DOF precision positioning platforms have appeared, which also means that the platform trend is developing towards large stroke and large load. At present, there are very few piezoelectric stack power supplies that drive large capacitive loads in China. Almost few companies have developed them, and they are expensive and have low performance. Summary of the invention

[0003] Purpose of the invention: The purpose of the present invention is to provide a high-efficiency, high-power, low-ripple cascade power amplification piezoelectric ceramic drive power supply.

[0004] Technical solution: The cascaded power amplification piezoelectric ceramic driving power supply described in the present invention includes a voltage-stabilizing power supply module, a control signal generating module, a linear amplification circuit module, a power amplification module and a load module;

[0005] The input end of the control signal generating module is connected to the input signal, the output end of the control signal generating module is connected to the in-phase input end of the linear amplifier circuit module, the output voltage of the linear amplifier circuit module is amplified by the power amplifier module, the output voltage drives the load module, and the output end of the load module is connected to the ground;

[0006] The voltage-stabilized power supply module includes a positive and negative low-voltage DC power supply and a positive and negative high-voltage DC power supply; the positive and negative low-voltage DC power supply supplies power to the control signal generation module and the linear amplifier circuit module; the positive and negative high-voltage DC power supply supplies power to the linear amplifier circuit module and the power amplifier module;

[0007] The linear amplifier circuit module includes a first-stage operational amplifier for reducing the offset voltage, lowering the resolution of the driving power supply and doubling the analog voltage signal of the digital-to-analog conversion, and a second-stage operational amplifier for amplifying and outputting the analog voltage signal of the first-stage operational amplifier; phase compensation and isolation resistors and feedback capacitors are added to the second-stage operational amplifier for stability compensation to prevent self-oscillation.

[0008] The control signal generating module includes a display screen, a keyboard, a core processing, a voltage required for digital-to-analog conversion (DAC) operation, and a waveform model. The program converts the voltage into binary and transmits it to the core processing calling program through an interface. The output end of the core processing is connected to the input end of the digital-to-analog conversion. The called program is transmitted to the digital-to-analog conversion and a single-core digital-to-analog conversion is used to convert the received digital signal into an analog voltage signal for output.

[0009] The linear amplifier circuit module is composed of two stages of operational amplifiers, wherein the first stage of operational amplifiers mainly reduces the offset voltage, lowers the resolution of the driving power supply, and doubles the analog voltage signal;

[0010] The pins of the first stage op amp are 1 to 8;

[0011] Pin 2 of the first stage operational amplifier is connected to resistor R2 and then to ground. Pin 2 is connected to resistor R5 and then to the first end of resistor R7 and the first end of isolation resistor Riso respectively. The second end of resistor R7 is connected to pin 1 of the second stage operational amplifier. The second end of isolation resistor Riso is connected to pin 8 of the second stage operational amplifier. Resistor R5 is connected in parallel with capacitor C5.

[0012] Pin 3 of the first-stage op amp is connected to resistor R1 and then to the analog voltage signal output by the digital-to-analog converter;

[0013] Pin 4 of the first-stage op amp is connected to a negative low voltage, pin 4 is connected to the positive electrode of capacitor C1 and then to ground, capacitor C1 is connected in parallel with capacitor C2;

[0014] The output pin 6 of the first stage op amp is connected to the resistor R3 and then to the in-phase pin 2 of the second stage op amp, the pin 6 is connected to the anode of the diode D1 and then to the positive low voltage, and the pin 6 is connected to the cathode of the diode D2 and then to the negative low voltage;

[0015] Pin 7 of the first-stage operational amplifier is connected to a positive low voltage, pin 7 is connected to the positive electrode of capacitor C3 and then to ground, and capacitor C4 is connected in parallel with capacitor C3.

[0016] The linear amplifier circuit module is composed of two stages of operational amplifiers, the second stage operational amplifier amplifies the analog voltage signal output by the first stage operational amplifier by ten times and adds phase compensation and isolation resistors and feedback capacitors for stability compensation to prevent self-oscillation of the driving power supply;

[0017] The pins of the second stage op amp are 1 to 10;

[0018] Pin 1 of the second stage op amp is connected to resistor R4 and then to ground, pin 1 is connected to the anode of diode D3 and then to pin 2, pin 1 is connected to the cathode of diode D4 and then to pin 2, and capacitor C7 is connected in series between pin 1 and pin 8;

[0019] Pin 3 of the second stage op amp is connected to resistor R8 and then to the first end of capacitor C8, the second end of C8 is connected to pin 9 of the second stage op amp, the second end of C8 is connected in series with capacitor C9 and then to pin 10 of the second stage op amp;

[0020] Pin 4 of the second stage op amp is connected in series with resistor R6, capacitor C6 and then pin 5;

[0021] Pin 6 of the second-stage operational amplifier is connected to the positive high voltage, pin 6 is connected to the positive electrode of capacitor C12 and then to ground, capacitor C13 is connected in parallel with capacitor C12;

[0022] Pin 7 of the second stage operational amplifier is connected in series with resistor R9 and then to pin 8.

[0023] The first terminal of the isolation resistor Riso is connected to the positive high voltage after being connected to the anode of the diode D5, the first terminal is connected to the negative high voltage after being connected to the cathode of the diode D6, and the first terminal is connected to the power amplifier module.

[0024] Resistors R5 and R2 are adjustable resistors, and the ratio of R5 to R2 is used to determine the amplification factor of the output voltage and input voltage of the driving power supply; capacitor C5 is used for dynamic following of the power supply.

[0025] The power amplifier module is composed of a Class A and Class B dual power supply complementary symmetrical circuit, and the components used include T1, T2, T3, T4, R10, R11, Re3, and Rc3, and are connected to positive high voltage and negative high voltage; in the positive half cycle of the input signal, T1 is turned on, T2 is turned off, and the output signal is the positive half cycle; in the negative half cycle of the input signal, T2 is turned on, T1 is turned off, and the output signal is the negative half cycle; T1 and T2 form a complementary output stage, and in static state, this circuit uses a UBE expansion circuit to bias the complementary symmetrical circuit, so as long as the ratio of R10 and R11 is adjusted, the bias value of T1 and T2 can be changed to make it in a slightly conductive state. Compared with the complementary symmetrical circuit using a diode for biasing, its bias voltage is not easy to adjust; compared with the Class B dual power supply complementary symmetrical circuit, this circuit can avoid the phenomenon of crossover distortion. The models of transistors T1 and T2 are IRF630 and IRF9630 respectively, and the power amplifier circuit increases the output current by about 200mA. In actual use, if the power is insufficient, multiple power amplifier circuits of this design can be cascaded, and the current amplification effect can be superimposed. The power amplifier module is connected to PZT and then grounded.

[0026] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0027] 1. The present invention can perform incremental power amplification on the output current, overcome the crossover distortion phenomenon and solve the disadvantage that when the diode bias circuit wants to find a suitable bias voltage, D1 and D2 need to be carefully adjusted. By adjusting the ratio of R10 and R11, the bias values ​​of T1 and T2 can be conveniently changed to put them in a micro-conduction state, thereby increasing power and achieving high precision;

[0028] 2. The present invention adopts a two-stage operational amplifier, and the first stage operational amplifier can double the voltage, reduce the offset voltage and reduce the resolution of the driving power supply;

[0029] 3. The present invention adds phase compensation and isolation resistors and feedback capacitors to perform stability compensation to prevent self-oscillation;

[0030] 4. The present invention adds capacitors to the Cc- and -Vs pins to prevent oscillations generated by the falling edge of the output end;

[0031] 5. The present invention uses a single-chip microcomputer to design a signal generator, which has good human-computer interaction and powerful functions. The embedded development selects the required functions according to the keyboard and display screen. The digital-to-analog conversion can be used to convert data and analog signals. The signal generator can emit waveforms such as sine waves, square waves, triangle waves, and sawtooth waves;

[0032] 6. The present invention is a driving power supply with high efficiency, simple structure, high power and low ripple. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is the principle diagram of the present invention;

[0034] Figure 2 It is a circuit diagram of the present invention. DETAILED DESCRIPTION

[0035] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0036] like Figure 1 and 2 As shown, a cascaded power amplification piezoelectric ceramic driving power supply includes a voltage-stabilizing power supply module, a control signal generating module, a linear amplification circuit module, a power amplification module and a load module;

[0037] The input end of the control signal generating module is connected to the input signal, the output end of the control signal generating module is connected to the in-phase input end of the linear amplifier circuit module, the output voltage of the linear amplifier circuit module is amplified by the power amplifier module, the output voltage drives the load module, and the output end of the load module is connected to the ground;

[0038] The voltage-stabilized power supply module includes a positive and negative low-voltage DC power supply and a positive and negative high-voltage DC power supply; the positive and negative low-voltage DC power supply supplies power to the control signal generation module and the linear amplifier circuit module; the positive and negative high-voltage DC power supply supplies power to the linear amplifier circuit module and the power amplifier module;

[0039] The linear amplifier circuit module includes a first-stage operational amplifier for reducing the offset voltage, lowering the resolution of the driving power supply and doubling the analog voltage signal of the digital-to-analog conversion, and a second-stage operational amplifier for amplifying and outputting the analog voltage signal of the first-stage operational amplifier; phase compensation and isolation resistors and feedback capacitors are added to the second-stage operational amplifier for stability compensation to prevent self-oscillation.

[0040] The control signal generating module includes a display screen, a keyboard, a core processing, a voltage required for digital-to-analog conversion (DAC) operation, and a waveform model. The program converts the voltage into binary and transmits it to the core processing calling program through an interface. The output end of the core processing is connected to the input end of the digital-to-analog conversion. The called program is transmitted to the digital-to-analog conversion and a single-core digital-to-analog conversion is used to convert the received digital signal into an analog voltage signal for output.

[0041] The linear amplifier circuit module is composed of two stages of operational amplifiers, wherein the first stage of operational amplifiers mainly reduces the offset voltage, lowers the resolution of the driving power supply, and doubles the analog voltage signal;

[0042] The pins of the first stage op amp are 1 to 8;

[0043] Pin 2 of the first stage operational amplifier is connected to resistor R2 and then to ground. Pin 2 is connected to resistor R5 and then to the first end of resistor R7 and the first end of isolation resistor Riso respectively. The second end of resistor R7 is connected to pin 1 of the second stage operational amplifier. The second end of isolation resistor Riso is connected to pin 8 of the second stage operational amplifier. Resistor R5 is connected in parallel with capacitor C5.

[0044] Pin 3 of the first-stage op amp is connected to resistor R1 and then to the analog voltage signal output by the digital-to-analog converter;

[0045] Pin 4 of the first-stage op amp is connected to a negative low voltage, pin 4 is connected to the positive electrode of capacitor C1 and then to ground, capacitor C1 is connected in parallel with capacitor C2;

[0046] The output pin 6 of the first stage op amp is connected to the resistor R3 and then to the in-phase pin 2 of the second stage op amp, the pin 6 is connected to the anode of the diode D1 and then to the positive low voltage, and the pin 6 is connected to the cathode of the diode D2 and then to the negative low voltage;

[0047] Pin 7 of the first-stage operational amplifier is connected to a positive low voltage, pin 7 is connected to the positive electrode of capacitor C3 and then to ground, and capacitor C4 is connected in parallel with capacitor C3.

[0048] The linear amplifier circuit module is composed of two stages of operational amplifiers, the second stage operational amplifier amplifies the analog voltage signal output by the first stage operational amplifier by ten times and adds phase compensation and isolation resistors and feedback capacitors for stability compensation to prevent self-oscillation of the driving power supply;

[0049] The pins of the second stage op amp are 1 to 10;

[0050] Pin 1 of the second stage op amp is connected to resistor R4 and then to ground, pin 1 is connected to the anode of diode D3 and then to pin 2, pin 1 is connected to the cathode of diode D4 and then to pin 2, and capacitor C7 is connected in series between pin 1 and pin 8;

[0051] Pin 3 of the second stage op amp is connected to resistor R8 and then to the first end of capacitor C8, the second end of C8 is connected to pin 9 of the second stage op amp, the second end of C8 is connected in series with capacitor C9 and then to pin 10 of the second stage op amp;

[0052] Pin 4 of the second stage op amp is connected in series with resistor R6, capacitor C6 and then pin 5;

[0053] Pin 6 of the second-stage operational amplifier is connected to the positive high voltage, pin 6 is connected to the positive electrode of capacitor C12 and then to ground, capacitor C13 is connected in parallel with capacitor C12;

[0054] Pin 7 of the second stage operational amplifier is connected in series with resistor R9 and then to pin 8.

[0055] The first terminal of the isolation resistor Riso is connected to the positive high voltage after being connected to the anode of the diode D5, the first terminal is connected to the negative high voltage after being connected to the cathode of the diode D6, and the first terminal is connected to the power amplifier module.

[0056] Resistors R5 and R2 are adjustable resistors, and the ratio of R5 to R2 is used to determine the amplification factor of the output voltage and input voltage of the driving power supply; capacitor C5 is used for dynamic following of the power supply.

[0057] The power amplifier module is composed of a Class A and Class B dual power supply complementary symmetrical circuit, and the components used include T1, T2, T3, T4, R10, R11, Re3, and Rc3, and are connected to positive high voltage and negative high voltage; in the positive half cycle of the input signal, T1 is turned on, T2 is turned off, and the output signal is the positive half cycle; in the negative half cycle of the input signal, T2 is turned on, T1 is turned off, and the output signal is the negative half cycle; T1 and T2 form a complementary output stage, and in static state, this circuit uses a UBE expansion circuit to bias the complementary symmetrical circuit, so as long as the ratio of R10 and R11 is adjusted, the bias value of T1 and T2 can be changed to make it in a slightly conductive state. Compared with the complementary symmetrical circuit using a diode for biasing, its bias voltage is not easy to adjust; compared with the Class B dual power supply complementary symmetrical circuit, this circuit can avoid the phenomenon of crossover distortion. The models of transistors T1 and T2 are IRF630 and IRF9630 respectively, and the power amplifier circuit increases the output current by about 200mA. In actual use, if the power is insufficient, multiple power amplifier circuits of this design can be cascaded, and the current amplification effect can be superimposed. The power amplifier module is connected to PZT and then grounded.

Claims

1. A cascaded power amplifier piezoelectric ceramic driving power supply, characterized in that: It includes a voltage-stabilized power supply module, a control signal generating module, a linear amplifying circuit module, a power amplifying module and a load module; The input end of the control signal generating module is connected to the input signal, the output end of the control signal generating module is connected to the in-phase input end of the linear amplifier circuit module, the output voltage of the linear amplifier circuit module is amplified by the power amplifier module, the output voltage drives the load module, and the output end of the load module is connected to the ground; The voltage-stabilized power supply module includes a positive and negative low-voltage DC power supply and a positive and negative high-voltage DC power supply; the positive and negative low-voltage DC power supply supplies power to the control signal generation module and the linear amplifier circuit module; the positive and negative high-voltage DC power supply supplies power to the linear amplifier circuit module and the power amplifier module; The linear amplifier circuit module includes a first-stage operational amplifier for reducing the offset voltage, lowering the resolution of the driving power supply and doubling the analog voltage signal of the digital-to-analog conversion, and a second-stage operational amplifier for amplifying and outputting the analog voltage signal of the first-stage operational amplifier; phase compensation and isolation resistors and feedback capacitors are added to the second-stage operational amplifier for stability compensation; The linear amplifier circuit module is composed of two stages of operational amplifiers, wherein the first stage of operational amplifiers mainly reduces the offset voltage, lowers the resolution of the driving power supply, and doubles the analog voltage signal of the digital-to-analog conversion; The pins of the first stage op amp are 1 to 8; Pin 2 of the first stage operational amplifier is connected to resistor R2 and then to ground. Pin 2 is connected to resistor R5 and then to the first end of resistor R7 and the first end of isolation resistor Riso respectively. The second end of resistor R7 is connected to pin 1 of the second stage operational amplifier. The second end of isolation resistor Riso is connected to pin 8 of the second stage operational amplifier. Resistor R5 is connected in parallel with capacitor C5. Pin 3 of the first-stage op amp is connected to resistor R1 and then to the analog voltage signal output by the digital-to-analog converter; Pin 4 of the first-stage op amp is connected to a negative low voltage, pin 4 is connected to the positive electrode of capacitor C1 and then to ground, capacitor C1 is connected in parallel with capacitor C2; The output pin 6 of the first stage op amp is connected to the resistor R3 and then to the in-phase pin 2 of the second stage op amp, the pin 6 is connected to the anode of the diode D1 and then to the positive low voltage, and the pin 6 is connected to the cathode of the diode D2 and then to the negative low voltage; Pin 7 of the first-stage operational amplifier is connected to a positive low voltage, pin 7 is connected to the positive electrode of capacitor C3 and then to ground, and capacitor C4 is connected in parallel with capacitor C3; The linear amplifier circuit module is composed of two stages of operational amplifiers, the second stage operational amplifier amplifies the analog voltage signal output by the first stage operational amplifier by ten times and adds phase compensation and isolation resistors and feedback capacitors for stability compensation to prevent self-oscillation of the driving power supply; The pins of the second stage op amp are 1 to 10; Pin 1 of the second stage op amp is connected to resistor R4 and then to ground, pin 1 is connected to the anode of diode D3 and then to pin 2, pin 1 is connected to the cathode of diode D4 and then to pin 2, and capacitor C7 is connected in series between pin 1 and pin 8; Pin 3 of the second stage op amp is connected to resistor R8 and then to the first end of capacitor C8, the second end of C8 is connected to pin 9 of the second stage op amp, the second end of C8 is connected in series with capacitor C9 and then to pin 10 of the second stage op amp; Pin 4 of the second stage op amp is connected in series with resistor R6, capacitor C6 and then pin 5; Pin 6 of the second-stage operational amplifier is connected to the positive high voltage, pin 6 is connected to the positive electrode of capacitor C12 and then to ground, capacitor C13 is connected in parallel with capacitor C12; Pin 7 of the second stage operational amplifier is connected in series with resistor R9 and then to pin 8.

2. The cascaded power amplifying piezoelectric ceramic driving power supply according to claim 1, characterized in that: The control signal generating module includes a display screen, a keyboard, a core processing, and the voltage and waveform model required for the digital-to-analog conversion operation. The voltage and waveform model are converted into binary by the program and transmitted to the core processing calling program through the interface. The output end of the core processing is connected to the input end of the digital-to-analog conversion. The called program is transmitted to the digital-to-analog conversion and a single-core digital-to-analog conversion is used to convert the received digital signal into an analog voltage signal for output.

3. The cascaded power amplifying piezoelectric ceramic driving power supply according to claim 1, characterized in that: The first terminal of the isolation resistor Riso is connected to the positive high voltage after being connected to the anode of the diode D5, the first terminal is connected to the negative high voltage after being connected to the cathode of the diode D6, and the first terminal is connected to the power amplifier module.

4. The cascaded power amplifying piezoelectric ceramic driving power supply according to claim 1, characterized in that: Resistors R5 and R2 are adjustable resistors, and the ratio of R5 to R2 is used to determine the amplification factor of the output voltage and input voltage of the driving power supply; capacitor C5 is used for dynamic following of the power supply.

5. The cascaded power amplifying piezoelectric ceramic driving power supply according to claim 1, characterized in that: The power amplifier module is composed of a Class A and B dual-power complementary symmetrical circuit, and the components used include T1, T2, T3, T4, R10, R11, Re3, and Rc3, which are connected to positive high voltage and negative high voltage; in the positive half cycle of the input signal, T1 is turned on, T2 is turned off, and the output signal is the positive half cycle; in the negative half cycle of the input signal, T2 is turned on, T1 is turned off, and the output signal is the negative half cycle; T1 and T2 form a complementary output stage, and when static, the ratio of R10 and R11 is adjusted to change the bias values ​​of T1 and T2 to put them in a slightly conductive state; in actual use, when the power is insufficient, multiple power amplifier circuits of this design are cascaded to superimpose the current amplification effect; the power amplifier module is connected to PZT and then grounded.

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